Expanding forming punch



Feb. 18, 1947. Q ,w 1 I 2,415,925

EXPANDING FORMING PUNCH Fiied April 20, 1945 t 2 Sheets-Sheet 1 IINVENTOR. 1.55 fi7, M15)? Patented Feb. 18, 1947 EXPANDING FORMING PUNCHLee M. Wiley, Marion, Ind., assignor of one-half to Julian T. Lett,Marion, Ind.

Application April 20, 1945, Serial N 0. 589,375

7 Claims. 1

This invention relates to a male punch for forming a seamless deep drawnpaper receptacle such as a cup which is provided interiorly near itsopen end with a reentrant groove for cover reception and/or stackingpurposes.

A cup of this character is disclosed and claimed in copendingapplication Serial No. 561,-

8'79, filed November 4, 194.4, and entitled Stacking cups and containerfor same.

The chief object of the present invention is to provide outwardlyprojectable means for forming a reentrant groove on the inner wall of apaper receptacle.

The chief feature of the present invention resides in groove formingmeans and the mecha nism for projecting and retracting same from thesupporting punch.

Other objects and features of the invention will be set forth more fullyhereinafter.

The full nature of the invention will be understood from theaccompanying drawings and the following description and claims:

In the drawings Fig. l is a vertical sectional view of the punchembodying the invention.

Fig. 2 is a side elevation thereof and taken at the left side of Fig. 1.

Fig. 3 is a transverse sectional view (looking up) of the cam containingshell and a bottom plan view of the actuating cam ring.

Fig. 4 is a side elevation of the actuating cam ring.

Fig. 5 is a top plan view of the segmental groove creaser in extendedrelation.

Fig. 6 is a side elevational thereof.

Fig. '7 is an enlarged radial sectional view of a groove creasingsegment and the two immediately adjacent portions of the punch.

Fig. 8 is a view similar to Fig. 5 with parts in contracted position.

In Figs. 1 and 2, it! indicates a connecting and actuating portion rigidwith base H having passage l3 therethrough and to which maybeselectively connected a source of air pressure or suction depending uponwhich type of pressure is desired to be utilized.

A base M is suitably secured at l5 to base ii. This base may, with baseH, be elongated, see Fig. 2. The former has projecting therefrom thespaced tubular portions it, only one of which is shown herein. This tubeIt has a central bore ll extending inwardly from its free end [8 andthrough the tube and base M is the reduced extension !9 enlarged as at2d at the base end.

Passage 21, through the base and a portion of tube I6, communicates atone end 22 with bore l1 near the inner end thereof and at its oppositeend 23 with passage I3.

Housing 24 seated in recess 25 is secured at 26 with and by cover 21.Extending through bases H and it are the registering passages 28 and 29respectively and a dual conductor 30 is passed therethrough andconnected, after passing through cover 21 to terminals 3|. Transversechannel 32 provides communication between bore 89 and the housing 2'5,see Fig. 1. Busbars are common to all punch heaters.

A male die or punch 33 has a coaxial stem 3 3 projecting therefrom atthe anchoring end and said stem, see Fig. 2, includes notch 35 to seatretainer 36 carried by tubular member l6. stem is threaded at 31 to takenut 38 nested in channel 39 in collar 40.

Collar M, at its end opposite the channel 39, includes the externalannular reduction or groove 4! and at one side, projecting upwardlytherefrom, is the groove or slot 42 registering with extension 32a inthe tube Hi. A collar 43 has one end seated in groove ll and anextension or tongue is seatable in the registering grooves 42 and Ma.Locating and securing means 45 and it secure collars l3 and ll)together. Locator 38a prevents relative rotation between nut 38 andcollar to. Collar 53 has slot M therein in which is positioned arm E8 towhich reference will be had hereinafter.

Stem 3t and punch 33 are provided with a suitable number of elongatedpassages 48, closed at the stem end and having slightly restrictedopenings Ell at the opposite and die end, same opening upon the facethereof. Stem 34 has annular channel 5! which registers with crosspassage 22, see Fig. 1. By this port and passage arrangement airpressure or suction applied at passage it can be applied at the male dietermination of openings 5i! and to the cup for trapped air release, cupretention and cup separation as desired.

This stern and male die includes central bore 52 in the die end of whichis mounted electric heater 53. In this bore is an insulation sleeve 5%and therein are current conductors 55 which extend into bore HQ withwhich bore 52 registers and through cross passage 32 into box 24, thereconnecting to terminals 21 aforesaid] This provides a heated diestructure.

Referrin more particularly to Figs. 1 and 3 to 7, it will be noted, seeFig. 1, between collar 43 and stem 3% is an annular channel 56 in whichis oscillatably supported cam ring 51 having on one face an annularseries of radial serrations 58. Handle it aforesaid is rigid with saidring and oscillates in slot 5'! in collar 43, see Figs. 1, 2 and 3. v

Adjacent cam ring 51, see Fig. 1, is a co-operating follower and conering 59 which has a plate portion 6E! in said channel 56 confrontingserrated cam ring 57. It has a confronting series of radial serrations6| cooperating with serrations 58. Collar 43 has internal shoulder 62suit- This p ably recessed at 63 (an annular series thereof) to nestsprings 64. These springs normally constrain the cone ring serrationsinto cam ring serration contact.

Shoulder 62 also includes a plurality of spaced (annular series) guidepins 55 which seat and slide in holes 65 in the cone ring. Thus the conering is confined to axial movement only and held constrained toward thecam ring and in the rotation of the latter, the cone ring is movedaxially against the force of springs 64.

The cone ring has cone face 61. Thereabout are a plurality of creasingor grooving segments, see Figs. 5, 6 and 8. One set 68 is of pie slicesegment outline and the other set 69 is of wedge or keystone segmentoutline. Each segment, see

Figs. 6 and 7, includes a coplaner body portion 10,

an intermediate arcuate projection H, an upper reentrant portion 12 anda lower and larger and deeper reentrant portion 120..

When the segments are extended outwardly, these parts are positioned asshown by full lines in Figs. and 7. When contracted, see Fig. 8, portionH of the pie slice segment is within the projection of portion 12 whenextended, see dotted lines Figs. 7. Each segment body portion hasdepending therefrom an inner arcuate flange 13, see Fig. 1, and eachflange is radially and externally recessed as at 14. These flanges nestin channel 15 in the stem end of the male die. In each recess is aspring 16 normally constraining each segment to contracted position. Thesprings may have the same strength or the keystone segment springs maybe stronger as desired.

Each keystone segment 69 at the inner end has inclined face 1'! and eachpie slice segment has at its inner end the inclined face 18. These havethe same slope. Extension and contraction of the segments is as follows:When the segments are positioned as shown in Fig. 8, handle 48 isshifted in slot il. serrations 58 engage serrations SI of the ringhaving cone end 61. Since this ring only has axial movement, it, inopposition to springs 5 is forced toward the male die end.

Initially the conical end 6'1 engages inner in- J clined faces 1"! andforces the wedge segments outwardly. In so doing the side faces alsoforce the pie slice segments outwardly as by a squeezing action and inopposition to all springs 64 in all segments. inner inclined faces 18 ofthe pie segments *68, if not extended by such prior engagement, suchsegments 68 and the wedge segments 69 are held fully extended as shownin Figs. 5 to 7.

This segment extension occurs only after the male die 23 has been seatedin the cup in a receiver mold. Upon segment extension the cup covernesting seat and retaining inner groove is formed in the cup. Uponcontraction of the segments, permitted when handle 48 is returned tooriginal position, the male die may be removed from the receiver mold.

As previously explained, suction applied at 13 permits the seating ofdie 33 in the cup by removing air trapped between the cup and die, aswell as insures cup retention on the die until cup separation isdesired. Pressure fluid then applied at I3 ejects the cup from the maledie and clears the suction ports 50.

While the invention has been illustrated and described in great detailin the drawings and foregoing description, the same is to be consid-Thereafter conical end 51 engages 4 ered as illustrative and notrestrictive in character.

The several modifications described herein, as well a others which willreadily suggest themselves to persons skilled in this art, all areconsidered to be within the broad scope of the invention, referencebeing had to the appended claims.

The invention claimed is:

1. A die structure including in combination an oscillatable cam ring, anaxial reciprocable cam ring normally constrained to first ringengagement and having a conoidal end, a plurality of segments thereaboutand normally constrained toward contracted position, and inclined faceson said segments and conoidal end engageable for segment projectionoutwardly upon first cam ring axial movement of the second cam ring.

2. A die structure as defined by claim 1 wherein the segments arealternated and one series is of pie slice shape and the other series isof wedge shape.

3. A die structure as defined by claim 1 wherein the segments arealternated and one series is of pie slice shape and the other series isof wedge shape, said conoidal end having initial contact with the wedgesegment for Wedge segment projection of the pie segments.

4. A die structure as defined by claim 1 wherein the segments arealternated and one series is of pie slice shape and the other series isof wedge shape, said conoidal end having initial contact with the wedgesegment for wedge segment projection of the pie segments, final contactof the conoidal end with all segments retaining all segments inprojected position.

5. A die structure as defined by claim 1 wherein there is provided a diehead and a detachably connected supporting structure between which isinterposed the rings and segments.

6. A die structure as defined by claim 1 wherein there i provided a diehead and a detachably connected supporting structure between which isinterposed the rings and segments, the latter bein exposed peripherally,the supporting structure having an arcuate slot therein, and a manuallyoscillatable member in the slot and rigid with the first cam ring foroscillation thereof.

7. A die structure as defined by claim 1 wherein electric heating meansfor die heating is provided and conductors connected to the heatin meansand passing through the confronting rings.

LEE M. WILEY.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 857,123 Tiffany June 18, 19071,549,868 Grotnes Aug. 18, 1925 1,553,504 Buchanan Sept. 15, 19252,118,080 Goodwin May 24, 1938 2,278,299 Barbieri Mar. 31, 19422,337,581 Wiley Dec. 28, 1943 FOREIGN PATENTS Number Country Date138,612 Swiss May 16, 1930

